Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dadd8378bbf9c2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 00:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9eff32fcc8087f2102a254b865c2a6c2 SHA-1: 70f9568264c1359ea0ce6187e1ae5fe50b5fceec SHA-256: 71dadd8378bbf9c291f078656cdf13bed5951d4ef7ecde8f951efb836eaf8b2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs, many hosted on compromised CMS uploads or disposable domains, indicate a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=pharmacokinetics+properties+of+drugs+pdf PDF link annotation
    • http://streathamtaxi.com/survey/userfiles/files/350004915.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/45af0393dd41e66b2710c7979e771b07/fajonanodigutawab.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/21734052456.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/gqqeoc4dm7kv3a2gk1kvp5dbfv/64134140314.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/serilakokav.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/zisopifodetepinitigasamu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16098aeee2a326---deresimepibomifotej.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/63794244482.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/hom7cipapdhee6rokd0furrvvc/23228746504.pdfIn PDF document text
    • http://industrialdevices.in/uploads/7096823920.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161028edb401c2---16636460314.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c18c1a35---27734854418.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/xenaxidilonukevojuzisujox.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f64f11c0891---wusupexo.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/18290605288.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/c3a501c64d57b7a20bfcf23e0958fee1/bebatefelemafeboguw.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5613b531d---meripa.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/65b2eadc2bf6197da73aaa685f5fafc1/3176510472.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b45eaba36---81644060858.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/47815600064.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7dee8e19fd441e31c999742430de944d/6494173735.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 11216 bytes
SHA-256: 42a325b3514565663cd46d6b647e5c07fe13ddbd63e84955dbc839c3c152b2ff
font_01_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 19236 bytes
SHA-256: 4403ac43a981ba08cf4bcc0de6d90ac867b5a6998b2344a123809ff7c1aaaa15

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